Foundry molding machine



R. DUFFUS FOUNDRY MOLDING MACHINE Jan. 8 1924.

Fild sept. s,

1921 2 Sheets-Sheet 1 y fyi mfeoj Erw ASW,

Pif/y.

Jan. 8 1924.

R. DUFFUS FOUNDRY MOLDING MACHINE 2 Sheets-Sheet 2 Filed Sept. 5. 1921 is a specification.

Patented danv t, i924..

,lues

FOUNDRY /IOLDING MACHINE.

Application filed September 3, 1921.

To all whom t may concern:

Be it known that l, ROBERT DUrrUs, a subject of the King of Great Britain, esiding at Gladstone Road, Lutterworth, in the county of Leicester, England, have invented new and useful Improvements in Foundry folding Machines, of which the following rlhis invention has reference to certain improvements in or in connection with molding, pressing and the like machines used in foundry work and has for its primary object to provide for a deep, accurate and variable draw.

A further and no less important object aimed at siniplicity, both in construction and operation whereby not only has the improved machine a comparatively low first cost but it lends itself for use with unskilled labour.

When, as it is claimed, these advantages are accompanied by a very high standard of eiciency, it will be appreciated that the introduction of the improved machine is of considerable importance to the industrial world, since castings, which hitherto have been made by hand, can now easily be turned out in large numbers.

The present invention while more particularly designed for molding and pressing machines of the turn-over pattern plate type with hand operated pit draft mechanisms suitable for small repetition work is also applicable to larger machines of the class operated by power.

According to this invention the vertical shafts by which the pattern plate is raised and lowered, instead of being operated from their bottom extremities by short toggles are raised and lowered by comparatively long connecting rods hinged at their upper ends to an intermediate part of said shafts whilst their lower ends are connected with long cranks on the horizontal crank shaft. By this means the effort required in raising and lowering the pattern plate is considerably reduced while at the same time a much deeper draft is possible than hitherto.

The improved machine also embodies further useful features which will be hereinafter described with reference to the accompanying drawings wherein,

Figure 1 is a transverse sectional view on the line a-b of Figure 2 of a molding machine constructed according to this invention, the vertical shaft being shewn in its Serial No. 498,300.

low and high positions in full and dotted lines respectively.

Figure 2 is a part sectional side view of the complete machine with the vertical shafts in the bottoni position and the pattern plate brackets occupying a horizontal position.

Figure 3 is a part view of the upper ends of the vertical shafts showing the pattern plate brackets swung into a vertical position.

Figure t is a detail end View of the trunnion head carrying the trip stop.

Throughout the drawing like parts are designated by similar reference characters.

Referring to the drawing, 2, 2 represent the vertical shafts carrying trunnion heads 3, 3 at their upper ends in which the pattern plate brackets 4, 4 are rotatably mounted.

The said shafts are mounted so as to be lfree to reciprocate vertically in bearings in standards 5, 5 which are bolted down to a bed plate or frame 6 and are provided with removable inspection plates 7, 7 to facilitate access to the intermediate portions of said shafts.

The shafts 2, 2 are operated within the standards from a horizontal shaft 8 mounted loosely in bearings in the bed plate 6, by means of cranks 9, 9 which are keyed to said shaft. The free ends of the cranks are operatively and severally connected with the vertical shafts at an intermediate point in the latter by means of connecting rods 10 and shaft clamps 11.

The horizontal shaft 8 is turned to cause the cranks `to raise and lower the vertical shafts by means of a hand-lever l2 secured thereto at one end and working in a notched quadrant 13 with which a pawl 14 on the lever is adapted to engage to lock the shaft and levers in any desired position according .to the amount of draw required. The pawl can be arranged for operation from the handle of the lever as shewn.

The weight of the shafts 2, 2 and the parts carried thereby is counterbalanced by means of weights 15 which are suspended by chains or wire ropes 16 the upper ends of which pass over pulleys 17 and are secured to the shaft clamps 11. The pull on the chain is as will be seen substantially parallel with the vertical shafts so that lateral stresses are avoided.

Alternatively, the lower ends of the vertical shafts may be supported by stirrup bars suspended by chains or wire ropes passed Asi over pulleys in the standards and having their free ends attached to counter-weights.

The pattern plate (not shown) is adapted to slide between the slotted portions 4, sa, of the brackets 4, l and to be secured thereto in any readily releasable manner as by pins or bolts passed-through the holes i8.

In order to provide for a perfectly accurate draw which is particularly desirous in the case of a deep draft means are pro vided for locking the pattern plate in a plane truly at right angles to the axes of the vertical shafts. F or thisr purpose one of the Y trunnion heads 3 has laterally projecting` arms 3a one of which carries a trip stop 19 loosely pivoted thereto on a horizontal axis whilst the other is furnished with a locking catch arranged to turn about a vertical pivot. A stop 19 has a shouldered end which, as sliewii in Figure 1, closely overhangs the end of the arm 3 to which the stop is pivoted. rllhe free end of the said arm is rounded at 3P, see Figure el, to allow the stop 19 to malte a quarter turn on its pivot from the horizontal. Each end of the adjacent bracket carries a projecting lug 21 one of which when the patte -n' pla-c` is horizontal rests on the stop lli) wh t the other lug is engaged by the catch 2() the effect of which is to loch the plate firmly against the stop 19. When it is desired to turn the plate over the catch Q() is discn gaged from the lugI :21 on the adjacent end of therbracllet -i and the plate is then revolved about its truniiions in the direction of the arrow (Figure 1) until the lug 2i which was formerly engaged by the catch 20 has tripped by the stop 19, when the pl 'a is brought back to a horizontal position w the lng 21 taking a seating` on top of the stop 19 against which it is firmly locked by turning the locking catch Q() into engagement with the lug 21 on the opposite end of the bracket 4l.

ri"lie bed plate carrying the standards is provided with the customary trani rails (not shewn) for the molding boxes or 'the trucha by which they are introdlued into and removed from the machine.

lf desired also the machine may be provided with a presser head of any suitable design.

'ihe type of machine shewn in the accombe the case for the large size machines.

Otherwise for large, medium or small sizes the constructional features are as hei-einbefore described.

I claim:-

1. Foundry molding machine comprising in combination a pair of rotatable brackets independently mounted on lhorizontal axes and adapted to receive the pattern plate bctween them7 trunnion heads carrying said brackets, connecting` rod and crank mechanism for raising and lowering said heads, laterally projecting lugs on the opposite ends of one of said brackets, a stop pivoted at one side of the adjacent trunnion head and having a limited rotary movement from the horizontal to the vertical and adapted in the former position to form an abutment for one of the said lugs, a locking catch pivoted at the other side of the same ,trnn` nion head and adapted to be moved into engagement with the other of said lugs on the adjacent end of the pattern plate when the latter is brought down to the horizontal position against the said stop.

2. Foundry molding machine comprising iii combination a pair of rotatable brackets independently mounted on horizontal axes and adapted to receive the pattern plate between tliein, trunnion heads carryingI said brackets, means carried by one of said brackets and by the adjacent trunnion head for locking the pattern plate in a horizontal position, vertical shaftscarrying said trunnion heads at their upper ends, hollow standards supporting said shafts, a bed plate carrying said standards, a horizontal shaft rotatablymountedin said bed'plate, cranks on said shaft projecting verticallj.y below said shafts, clamps on said shafts, rods arranged parallel with said shafts and connecting the cranks with said clamps, a pulley mounted in the upper end of each standard above said clamp, and a cable coa iiected to said clamp and passing upwardly parallel with the 'vertical shaft over the said pulley and thence downwards beneath the.

bed plate and having a weight attached thereto. Y

HUBERT DUFFUS. 

